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<div class="title">/data/users/matthijs/github_faiss/faiss/IndexFlat.h</div>  </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (c) 2015-present, Facebook, Inc.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * This source code is licensed under the BSD+Patents license found in the</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">// Copyright 2004-present Facebook. All Rights Reserved</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment">// -*- c++ -*-</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;</div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="preprocessor">#ifndef INDEX_FLAT_H</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define INDEX_FLAT_H</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &lt;vector&gt;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;</div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &quot;Index.h&quot;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="keyword">namespace </span>faiss {</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment">/** Index that stores the full vectors and performs exhaustive search */</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexFlat.html">   23</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexFlat.html">IndexFlat</a>: <a class="code" href="structfaiss_1_1Index.html">Index</a> {<span class="comment"></span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment">    /// database vectors, size ntotal * d</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexFlat.html#a9001de47890fe5d2eced9551d3613d47">   25</a></span>&#160;<span class="comment"></span>    std::vector&lt;float&gt; <a class="code" href="structfaiss_1_1IndexFlat.html#a9001de47890fe5d2eced9551d3613d47">xb</a>;</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;    <span class="keyword">explicit</span> <a class="code" href="structfaiss_1_1IndexFlat.html">IndexFlat</a> (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> <a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a>, <a class="code" href="namespacefaiss.html#afd12191c638da74760ff397cf319752c">MetricType</a> metric = METRIC_INNER_PRODUCT);</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexFlat.html#a406f028c702edec72477eacc5733f59c">add</a>(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span>* x) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexFlat.html#ab63dc34ef5d33f98f94aa0ade7c7324f">reset</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexFlat.html#a85510d70f4675197df9988651e4692c9">search</a>(</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n,</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span>* x,</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> k,</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;        <span class="keywordtype">float</span>* distances,</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a>* labels) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexFlat.html#ac56b7ed90ab65fab9c586a1e56006d12">range_search</a>(</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n,</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span>* x,</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;        <span class="keywordtype">float</span> radius,</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        <a class="code" href="structfaiss_1_1RangeSearchResult.html">RangeSearchResult</a>* result) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexFlat.html#ae4b33315752b62cff1626f9f967167b1">reconstruct</a>(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> key, <span class="keywordtype">float</span>* recons) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="comment">    /** compute distance with a subset of vectors</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment">     *</span></div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="comment">     * @param x       query vectors, size n * d</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment">     * @param labels  indices of the vectors that should be compared</span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">     *                for each query vector, size n * k</span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment">     * @param distances</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment">     *                corresponding output distances, size n * k</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexFlat.html#a14b51786e7f98be1954eef35d02813a7">compute_distance_subset</a> (</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;            <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n,</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;            <span class="keyword">const</span> <span class="keywordtype">float</span> *x,</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;            <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> k,</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;            <span class="keywordtype">float</span> *distances,</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;            <span class="keyword">const</span> <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> *labels) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment">    /** remove some ids. NB that Because of the structure of the</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment">     * indexing structre, the semantics of this operation are</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">     * different from the usual ones: the new ids are shifted */</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    <span class="keywordtype">long</span> <a class="code" href="structfaiss_1_1IndexFlat.html#a8d1ea1d28e80849f8b0f5493679d68c9">remove_ids</a>(<span class="keyword">const</span> <a class="code" href="structfaiss_1_1IDSelector.html">IDSelector</a>&amp; sel) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    <a class="code" href="structfaiss_1_1IndexFlat.html">IndexFlat</a> () {}</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;};</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;</div>
<div class="line"><a name="l00073"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexFlatIP.html">   73</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexFlatIP.html">IndexFlatIP</a>:<a class="code" href="structfaiss_1_1IndexFlat.html">IndexFlat</a> {</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    <span class="keyword">explicit</span> <a class="code" href="structfaiss_1_1IndexFlatIP.html">IndexFlatIP</a> (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> <a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a>): <a class="code" href="structfaiss_1_1IndexFlat.html">IndexFlat</a> (d, METRIC_INNER_PRODUCT) {}</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    <a class="code" href="structfaiss_1_1IndexFlatIP.html">IndexFlatIP</a> () {}</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;};</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;</div>
<div class="line"><a name="l00079"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexFlatL2.html">   79</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexFlatL2.html">IndexFlatL2</a>:<a class="code" href="structfaiss_1_1IndexFlat.html">IndexFlat</a> {</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    <span class="keyword">explicit</span> <a class="code" href="structfaiss_1_1IndexFlatL2.html">IndexFlatL2</a> (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> <a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a>): <a class="code" href="structfaiss_1_1IndexFlat.html">IndexFlat</a> (d, METRIC_L2) {}</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;    <a class="code" href="structfaiss_1_1IndexFlatL2.html">IndexFlatL2</a> () {}</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;};</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="comment">// same as an IndexFlatL2 but a value is subtracted from each distance</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexFlatL2BaseShift.html">   86</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexFlatL2BaseShift.html">IndexFlatL2BaseShift</a>: <a class="code" href="structfaiss_1_1IndexFlatL2.html">IndexFlatL2</a> {</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    std::vector&lt;float&gt; shift;</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    <a class="code" href="structfaiss_1_1IndexFlatL2BaseShift.html">IndexFlatL2BaseShift</a> (<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> <a class="code" href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">d</a>, <span class="keywordtype">size_t</span> nshift, <span class="keyword">const</span> <span class="keywordtype">float</span> *shift);</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexFlatL2BaseShift.html#a16e9bf1aec9d18b3ebbe78fea6bfecc0">search</a>(</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n,</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span>* x,</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> k,</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;        <span class="keywordtype">float</span>* distances,</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a>* labels) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;};</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="comment">/** Index that queries in a base_index (a fast one) and refines the</span></div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;<span class="comment"> *  results with an exact search, hopefully improving the results.</span></div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexRefineFlat.html">  103</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexRefineFlat.html">IndexRefineFlat</a>: <a class="code" href="structfaiss_1_1Index.html">Index</a> {</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="comment">    /// storage for full vectors</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexRefineFlat.html#aab99f32713ece942ccefccf306292ca0">  106</a></span>&#160;<span class="comment"></span>    <a class="code" href="structfaiss_1_1IndexFlat.html">IndexFlat</a> <a class="code" href="structfaiss_1_1IndexRefineFlat.html#aab99f32713ece942ccefccf306292ca0">refine_index</a>;</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;<span class="comment">    /// faster index to pre-select the vectors that should be filtered</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexRefineFlat.html#a4acc0b3a8c33e5dd8851448ac162dfd0">  109</a></span>&#160;<span class="comment"></span>    <a class="code" href="structfaiss_1_1Index.html">Index</a> *<a class="code" href="structfaiss_1_1IndexRefineFlat.html#a4acc0b3a8c33e5dd8851448ac162dfd0">base_index</a>;</div>
<div class="line"><a name="l00110"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexRefineFlat.html#aaf0f6a094de0e9409effa81bedb9c7e2">  110</a></span>&#160;    <span class="keywordtype">bool</span> <a class="code" href="structfaiss_1_1IndexRefineFlat.html#aaf0f6a094de0e9409effa81bedb9c7e2">own_fields</a>;  <span class="comment">///&lt; should the base index be deallocated?</span></div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;<span class="comment"></span><span class="comment"></span></div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;<span class="comment">    /// factor between k requested in search and the k requested from</span></div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;<span class="comment">    /// the base_index (should be &gt;= 1)</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexRefineFlat.html#a7383fabb28db5b0df45ca4ea81f7acd4">  114</a></span>&#160;<span class="comment"></span>    <span class="keywordtype">float</span> <a class="code" href="structfaiss_1_1IndexRefineFlat.html#a7383fabb28db5b0df45ca4ea81f7acd4">k_factor</a>;</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;    <span class="keyword">explicit</span> <a class="code" href="structfaiss_1_1IndexRefineFlat.html">IndexRefineFlat</a> (<a class="code" href="structfaiss_1_1Index.html">Index</a> *<a class="code" href="structfaiss_1_1IndexRefineFlat.html#a4acc0b3a8c33e5dd8851448ac162dfd0">base_index</a>);</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;    <a class="code" href="structfaiss_1_1IndexRefineFlat.html">IndexRefineFlat</a> ();</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexRefineFlat.html#a79c4c9b9ffabc4460ef4def6eb962e68">train</a>(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span>* x) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexRefineFlat.html#a10d5009c838e8653fd767ca48a3e6fcc">add</a>(<a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span>* x) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexRefineFlat.html#ac3efe902315768afe83fa2b8ea5dc591">reset</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexRefineFlat.html#ad04444de1e2c26c463cc52f3c076dd41">search</a>(</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> n,</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span>* x,</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a> k,</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;        <span class="keywordtype">float</span>* distances,</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;        <a class="code" href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">idx_t</a>* labels) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;    ~<a class="code" href="structfaiss_1_1IndexRefineFlat.html">IndexRefineFlat</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;};</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;<span class="comment">/// optimized version for 1D &quot;vectors&quot;</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexFlat1D.html">  138</a></span>&#160;<span class="comment"></span><span class="keyword">struct </span><a class="code" href="structfaiss_1_1IndexFlat1D.html">IndexFlat1D</a>:<a class="code" href="structfaiss_1_1IndexFlatL2.html">IndexFlatL2</a> {</div>
<div class="line"><a name="l00139"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexFlat1D.html#a8b025a468b088a343cf8079006de45e2">  139</a></span>&#160;    <span class="keywordtype">bool</span> <a class="code" href="structfaiss_1_1IndexFlat1D.html#a8b025a468b088a343cf8079006de45e2">continuous_update</a>; <span class="comment">///&lt; is the permutation updated continuously?</span></div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00141"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexFlat1D.html#a3442f0d86a14108534f99eea0b7d4d3f">  141</a></span>&#160;    std::vector&lt;idx_t&gt; <a class="code" href="structfaiss_1_1IndexFlat1D.html#a3442f0d86a14108534f99eea0b7d4d3f">perm</a>; <span class="comment">///&lt; sorted database indices</span></div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;    <span class="keyword">explicit</span> <a class="code" href="structfaiss_1_1IndexFlat1D.html">IndexFlat1D</a> (<span class="keywordtype">bool</span> <a class="code" href="structfaiss_1_1IndexFlat1D.html#a8b025a468b088a343cf8079006de45e2">continuous_update</a>=<span class="keyword">true</span>);</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;<span class="comment">    /// if not continuous_update, call this between the last add and</span></div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;<span class="comment">    /// the first search</span></div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexFlat1D.html#ac7466c6c9b1e9e81ea19b846ddb8209e">update_permutation</a> ();</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexFlat1D.html#a5dc39280262484ecadda5e11162c2457">add</a>(idx_t n, <span class="keyword">const</span> <span class="keywordtype">float</span>* x) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexFlat1D.html#aa205c4ffa6cbd50f49ef9cb6cc050000">reset</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;<span class="comment">    /// Warn: the distances returned are L1 not L2</span></div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;<span class="comment"></span>    <span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexFlat1D.html#a65736f2900865cd156faba4fcd260d05">search</a>(</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;        idx_t n,</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span>* x,</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;        idx_t k,</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;        <span class="keywordtype">float</span>* distances,</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;        idx_t* labels) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;};</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;}</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="ttc" id="structfaiss_1_1IndexFlatL2BaseShift_html_a16e9bf1aec9d18b3ebbe78fea6bfecc0"><div class="ttname"><a href="structfaiss_1_1IndexFlatL2BaseShift.html#a16e9bf1aec9d18b3ebbe78fea6bfecc0">faiss::IndexFlatL2BaseShift::search</a></div><div class="ttdeci">void search(idx_t n, const float *x, idx_t k, float *distances, idx_t *labels) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00133">IndexFlat.cpp:133</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat_html"><div class="ttname"><a href="structfaiss_1_1IndexFlat.html">faiss::IndexFlat</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00023">IndexFlat.h:23</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexRefineFlat_html_ac3efe902315768afe83fa2b8ea5dc591"><div class="ttname"><a href="structfaiss_1_1IndexRefineFlat.html#ac3efe902315768afe83fa2b8ea5dc591">faiss::IndexRefineFlat::reset</a></div><div class="ttdeci">void reset() override</div><div class="ttdoc">removes all elements from the database. </div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00184">IndexFlat.cpp:184</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat1D_html_a8b025a468b088a343cf8079006de45e2"><div class="ttname"><a href="structfaiss_1_1IndexFlat1D.html#a8b025a468b088a343cf8079006de45e2">faiss::IndexFlat1D::continuous_update</a></div><div class="ttdeci">bool continuous_update</div><div class="ttdoc">is the permutation updated continuously? </div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00139">IndexFlat.h:139</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat1D_html"><div class="ttname"><a href="structfaiss_1_1IndexFlat1D.html">faiss::IndexFlat1D</a></div><div class="ttdoc">optimized version for 1D &amp;quot;vectors&amp;quot; </div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00138">IndexFlat.h:138</a></div></div>
<div class="ttc" id="structfaiss_1_1IDSelector_html"><div class="ttname"><a href="structfaiss_1_1IDSelector.html">faiss::IDSelector</a></div><div class="ttdef"><b>Definition:</b> <a href="AuxIndexStructures_8h_source.html#l00052">AuxIndexStructures.h:52</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlatL2_html"><div class="ttname"><a href="structfaiss_1_1IndexFlatL2.html">faiss::IndexFlatL2</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00079">IndexFlat.h:79</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat_html_a85510d70f4675197df9988651e4692c9"><div class="ttname"><a href="structfaiss_1_1IndexFlat.html#a85510d70f4675197df9988651e4692c9">faiss::IndexFlat::search</a></div><div class="ttdeci">void search(idx_t n, const float *x, idx_t k, float *distances, idx_t *labels) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00042">IndexFlat.cpp:42</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat_html_ab63dc34ef5d33f98f94aa0ade7c7324f"><div class="ttname"><a href="structfaiss_1_1IndexFlat.html#ab63dc34ef5d33f98f94aa0ade7c7324f">faiss::IndexFlat::reset</a></div><div class="ttdeci">void reset() override</div><div class="ttdoc">removes all elements from the database. </div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00036">IndexFlat.cpp:36</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat1D_html_ac7466c6c9b1e9e81ea19b846ddb8209e"><div class="ttname"><a href="structfaiss_1_1IndexFlat1D.html#ac7466c6c9b1e9e81ea19b846ddb8209e">faiss::IndexFlat1D::update_permutation</a></div><div class="ttdeci">void update_permutation()</div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00284">IndexFlat.cpp:284</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat_html_ae4b33315752b62cff1626f9f967167b1"><div class="ttname"><a href="structfaiss_1_1IndexFlat.html#ae4b33315752b62cff1626f9f967167b1">faiss::IndexFlat::reconstruct</a></div><div class="ttdeci">void reconstruct(idx_t key, float *recons) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00118">IndexFlat.cpp:118</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat1D_html_a5dc39280262484ecadda5e11162c2457"><div class="ttname"><a href="structfaiss_1_1IndexFlat1D.html#a5dc39280262484ecadda5e11162c2457">faiss::IndexFlat1D::add</a></div><div class="ttdeci">void add(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00294">IndexFlat.cpp:294</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat_html_a8d1ea1d28e80849f8b0f5493679d68c9"><div class="ttname"><a href="structfaiss_1_1IndexFlat.html#a8d1ea1d28e80849f8b0f5493679d68c9">faiss::IndexFlat::remove_ids</a></div><div class="ttdeci">long remove_ids(const IDSelector &amp;sel) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00095">IndexFlat.cpp:95</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlatIP_html"><div class="ttname"><a href="structfaiss_1_1IndexFlatIP.html">faiss::IndexFlatIP</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00073">IndexFlat.h:73</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexRefineFlat_html_ad04444de1e2c26c463cc52f3c076dd41"><div class="ttname"><a href="structfaiss_1_1IndexRefineFlat.html#ad04444de1e2c26c463cc52f3c076dd41">faiss::IndexRefineFlat::search</a></div><div class="ttdeci">void search(idx_t n, const float *x, idx_t k, float *distances, idx_t *labels) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00219">IndexFlat.cpp:219</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexRefineFlat_html_a4acc0b3a8c33e5dd8851448ac162dfd0"><div class="ttname"><a href="structfaiss_1_1IndexRefineFlat.html#a4acc0b3a8c33e5dd8851448ac162dfd0">faiss::IndexRefineFlat::base_index</a></div><div class="ttdeci">Index * base_index</div><div class="ttdoc">faster index to pre-select the vectors that should be filtered </div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00109">IndexFlat.h:109</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexRefineFlat_html"><div class="ttname"><a href="structfaiss_1_1IndexRefineFlat.html">faiss::IndexRefineFlat</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00103">IndexFlat.h:103</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexRefineFlat_html_aab99f32713ece942ccefccf306292ca0"><div class="ttname"><a href="structfaiss_1_1IndexRefineFlat.html#aab99f32713ece942ccefccf306292ca0">faiss::IndexRefineFlat::refine_index</a></div><div class="ttdeci">IndexFlat refine_index</div><div class="ttdoc">storage for full vectors </div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00106">IndexFlat.h:106</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexRefineFlat_html_aaf0f6a094de0e9409effa81bedb9c7e2"><div class="ttname"><a href="structfaiss_1_1IndexRefineFlat.html#aaf0f6a094de0e9409effa81bedb9c7e2">faiss::IndexRefineFlat::own_fields</a></div><div class="ttdeci">bool own_fields</div><div class="ttdoc">should the base index be deallocated? </div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00110">IndexFlat.h:110</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a2a002388d2c081c2dbab8508dcefe73d"><div class="ttname"><a href="structfaiss_1_1Index.html#a2a002388d2c081c2dbab8508dcefe73d">faiss::Index::d</a></div><div class="ttdeci">int d</div><div class="ttdoc">vector dimension </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00064">Index.h:64</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat_html_ac56b7ed90ab65fab9c586a1e56006d12"><div class="ttname"><a href="structfaiss_1_1IndexFlat.html#ac56b7ed90ab65fab9c586a1e56006d12">faiss::IndexFlat::range_search</a></div><div class="ttdeci">void range_search(idx_t n, const float *x, float radius, RangeSearchResult *result) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00058">IndexFlat.cpp:58</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexRefineFlat_html_a79c4c9b9ffabc4460ef4def6eb962e68"><div class="ttname"><a href="structfaiss_1_1IndexRefineFlat.html#a79c4c9b9ffabc4460ef4def6eb962e68">faiss::IndexRefineFlat::train</a></div><div class="ttdeci">void train(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00171">IndexFlat.cpp:171</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a040c6aed1f224f3ea7bf58eebc0c31a4"><div class="ttname"><a href="structfaiss_1_1Index.html#a040c6aed1f224f3ea7bf58eebc0c31a4">faiss::Index::idx_t</a></div><div class="ttdeci">long idx_t</div><div class="ttdoc">all indices are this type </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00062">Index.h:62</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat_html_a406f028c702edec72477eacc5733f59c"><div class="ttname"><a href="structfaiss_1_1IndexFlat.html#a406f028c702edec72477eacc5733f59c">faiss::IndexFlat::add</a></div><div class="ttdeci">void add(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00030">IndexFlat.cpp:30</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat1D_html_a65736f2900865cd156faba4fcd260d05"><div class="ttname"><a href="structfaiss_1_1IndexFlat1D.html#a65736f2900865cd156faba4fcd260d05">faiss::IndexFlat1D::search</a></div><div class="ttdeci">void search(idx_t n, const float *x, idx_t k, float *distances, idx_t *labels) const override</div><div class="ttdoc">Warn: the distances returned are L1 not L2. </div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00307">IndexFlat.cpp:307</a></div></div>
<div class="ttc" id="structfaiss_1_1RangeSearchResult_html"><div class="ttname"><a href="structfaiss_1_1RangeSearchResult.html">faiss::RangeSearchResult</a></div><div class="ttdef"><b>Definition:</b> <a href="AuxIndexStructures_8h_source.html#l00029">AuxIndexStructures.h:29</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat_html_a14b51786e7f98be1954eef35d02813a7"><div class="ttname"><a href="structfaiss_1_1IndexFlat.html#a14b51786e7f98be1954eef35d02813a7">faiss::IndexFlat::compute_distance_subset</a></div><div class="ttdeci">void compute_distance_subset(idx_t n, const float *x, idx_t k, float *distances, const idx_t *labels) const </div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00073">IndexFlat.cpp:73</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlatL2BaseShift_html"><div class="ttname"><a href="structfaiss_1_1IndexFlatL2BaseShift.html">faiss::IndexFlatL2BaseShift</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00086">IndexFlat.h:86</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html"><div class="ttname"><a href="structfaiss_1_1Index.html">faiss::Index</a></div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00060">Index.h:60</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat_html_a9001de47890fe5d2eced9551d3613d47"><div class="ttname"><a href="structfaiss_1_1IndexFlat.html#a9001de47890fe5d2eced9551d3613d47">faiss::IndexFlat::xb</a></div><div class="ttdeci">std::vector&lt; float &gt; xb</div><div class="ttdoc">database vectors, size ntotal * d </div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00025">IndexFlat.h:25</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexRefineFlat_html_a7383fabb28db5b0df45ca4ea81f7acd4"><div class="ttname"><a href="structfaiss_1_1IndexRefineFlat.html#a7383fabb28db5b0df45ca4ea81f7acd4">faiss::IndexRefineFlat::k_factor</a></div><div class="ttdeci">float k_factor</div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00114">IndexFlat.h:114</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat1D_html_aa205c4ffa6cbd50f49ef9cb6cc050000"><div class="ttname"><a href="structfaiss_1_1IndexFlat1D.html#aa205c4ffa6cbd50f49ef9cb6cc050000">faiss::IndexFlat1D::reset</a></div><div class="ttdeci">void reset() override</div><div class="ttdoc">removes all elements from the database. </div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00301">IndexFlat.cpp:301</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexFlat1D_html_a3442f0d86a14108534f99eea0b7d4d3f"><div class="ttname"><a href="structfaiss_1_1IndexFlat1D.html#a3442f0d86a14108534f99eea0b7d4d3f">faiss::IndexFlat1D::perm</a></div><div class="ttdeci">std::vector&lt; idx_t &gt; perm</div><div class="ttdoc">sorted database indices </div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8h_source.html#l00141">IndexFlat.h:141</a></div></div>
<div class="ttc" id="namespacefaiss_html_afd12191c638da74760ff397cf319752c"><div class="ttname"><a href="namespacefaiss.html#afd12191c638da74760ff397cf319752c">faiss::MetricType</a></div><div class="ttdeci">MetricType</div><div class="ttdoc">Some algorithms support both an inner product version and a L2 search version. </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00043">Index.h:43</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexRefineFlat_html_a10d5009c838e8653fd767ca48a3e6fcc"><div class="ttname"><a href="structfaiss_1_1IndexRefineFlat.html#a10d5009c838e8653fd767ca48a3e6fcc">faiss::IndexRefineFlat::add</a></div><div class="ttdeci">void add(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexFlat_8cpp_source.html#l00177">IndexFlat.cpp:177</a></div></div>
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